dm: Change CMD_DM enabling

CMD_DM is used for debug purpose and it shouldn't be enabled by default
via Kconfig. Unfortunately this is in the tree for quite a long time
that's why solution is to use imply DM for all targets which are
enabling DM.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/arch/arm/mach-imx/mx5/Kconfig b/arch/arm/mach-imx/mx5/Kconfig
index 1bb373b..051b15d 100644
--- a/arch/arm/mach-imx/mx5/Kconfig
+++ b/arch/arm/mach-imx/mx5/Kconfig
@@ -28,6 +28,7 @@
 	select DM_PMIC
 	select DM_SERIAL
 	select MX53
+	imply CMD_DM
 
 config TARGET_MX51EVK
 	bool "Support mx51evk"
@@ -44,6 +45,7 @@
 	select DM
 	select DM_SERIAL
 	select MX53
+	imply CMD_DM
 
 config TARGET_MX53EVK
 	bool "Support mx53evk"